CN105784396B - A kind of hydraulic system component reliability experimental rig and method comprising environment field - Google Patents
A kind of hydraulic system component reliability experimental rig and method comprising environment field Download PDFInfo
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- CN105784396B CN105784396B CN201610120518.8A CN201610120518A CN105784396B CN 105784396 B CN105784396 B CN 105784396B CN 201610120518 A CN201610120518 A CN 201610120518A CN 105784396 B CN105784396 B CN 105784396B
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Abstract
The present invention relates to a kind of hydraulic system component reliability experimental rigs and method comprising environment field, belong to hydraulic system component reliability experimental technique field.Monitoring device is fixed on three-dimensional vibrating platform upper surface, electrohydraulic servo device, attachment device and hydraulic pressure cylinder assembly are realized by bottom plate to being just fixed on the support frame later, three-position four-way electromagnetic directional valve, each sensor are mounted on the upper surface of braced frame, hydraulic pressure cylinder assembly is connected with three-position four-way electromagnetic directional valve by connected pipes, and Temperature and Humidity Control box assembly is mounted on the upper surface of three dimensional vibration table.By simulating actual condition to find out the weak link in hydraulic system, dynamic force, the load test of static force to hydraulic system are completed by electrohydraulic servo device, and impact test, relevant parameter when to obtain breaking down, it is very helpful to the design of hydraulic system, the reliability for improving hydraulic system plays an important role.
Description
Technical field
The present invention relates to a kind of, and the hydraulic system component (connector, pipeline, valve body, hydraulic cylinder) comprising environmental factor is reliable
Property experimental technique field experimental rig and reliability test method, shaken by three-dimensional it more particularly relates to a kind of
Moving platform, humiture case and loading device realize hydraulic system under different temperatures, humidity, vibration, pressure condition, to hydraulic pressure system
System carries out load test to simulate the reliability test and method of multi-state.
Background technology
With manufacturing continuous development, numerically-controlled machine tool becomes the indispensable tool in manufacturing industry, and hydraulic system is several
The premise that control lathe can work normally.Hydraulic system is widely used in modern industry field, especially engineering machinery,
Lifting device, numerically-controlled machine tool etc. are even more a kind of essential power source；However, there is one in use for hydraulic system
The problem of series, we are relatively fewer to the research of Hydraulic System Reliability；Especially in numerically-controlled machine tool, high pressure, vibration
Etc. factors the interface of hydraulic oil pipe can be made regular leakage phenomenon occur.Therefore, hydraulic system own reliability is improved
Level is all scientific worker's questions of common interest, is also played a crucial role to the reliability of entire lathe.
For this problem leaked existing for numerically-controlled machine tool hydraulic system, currently, the country is about the reliable of hydraulic system
Property experimental rig and method are very few；Meanwhile it is also seldom for reliability consideration of the hydraulic system under different operating modes, therefore study
Including the reliability test of the hydraulic system component of environment field has important practical significance.Now, about hydraulic pressure system
The research for reliability engineering of uniting mainly uses the methods of failure mode and effect analysis (FMEA), failure tree analysis (FTA) (FTA), master
Syllabus is the weak link found by experiment in hydraulic system, is improved design to its structure, reduces hydraulic system
Failure rate.In order to further increase the Stability and dependability of hydraulic work system, and the simulation hydraulic system of maximum possible
Actual condition, a kind of reliability test of the hydraulic system component comprising environment field of Patent design of the present invention and examination
Proved recipe method.
Invention content
The present invention provides a kind of hydraulic system component reliability experimental rig and method comprising environment field, to solve mesh
Preceding machine tool hydraulic system reliability is relatively low, the suitable experimental rig of neither one carrys out the reliability by experiment improvement hydraulic system
The problem of.To realize to numerical control machine tool hydraulic system under different temperatures, humidity, pressure, vibration condition, to hydraulic system into
Mobile state load, static loading, impact test provide corresponding experiment side to simulate hydraulic system actual condition
Method.
The technical solution adopted by the present invention is that：Three-dimensional vibrating platform is fixed on the ground by foundation bolt, monitoring device
It is fixed on three-dimensional vibrating platform upper surface, braced frame is fixed on the upper surface of three-dimensional vibrating platform, electrohydraulic servo device, connection
Device and hydraulic pressure cylinder assembly realized by bottom plate to being fixed on the support frame after just, three-position four-way electromagnetic directional valve,
Temperature sensor, flow sensor, pressure sensor are mounted on the upper surface of braced frame, hydraulic pressure cylinder assembly and 3-position 4-way electricity
Magnetic reversal valve is connected by connected pipes, and Temperature and Humidity Control box assembly is mounted on the upper surface of three dimensional vibration table.
The braced frame is plate parts, and braced frame is welded by four columns and a steel plate, the steel plate
On open 4 equidistant rectangular straight slot.
The Temperature and Humidity Control box assembly includes humiture chamber door, oil pipe hole, temperature controller, humidity controller, babinet,
The babinet is adiabatic class part, and front has humiture chamber door, side to open two oil pipe holes and be used for wearing fluid pressure line, the temperature
Degree controller and humidity controller are fixed on the boss at Temperature and Humidity Control box assembly rear.
The electrohydraulic servo device by pedestal, displacement sensor, electrohydraulic servo valve, Flexible element, electro-hydraulic servo extension bar,
Spoke type force snesor, connector composition, the pedestal are fixed to by screw on bottom plate, and the electro-hydraulic servo cylinder body passes through spiral shell
Nail is fixed on pedestal, and institute's displacement sensors are fixed to electro-hydraulic servo cylinder rear, and the electrohydraulic servo valve is mounted on electricity
Above liquid servo cylinder body, the Flexible element is fixed in electro-hydraulic servo extension bar, and the spoke type force snesor is fixed on electricity
On liquid servo extension bar, described connector one end is connect by screw thread with spoke type force snesor.
The attachment device is made of pin one, load slide plate, sliding block, elastic damping unit, and the load slide plate passes through
Bolt is connect with bottom plate, and the sliding block is slidably connected by T-shaped boss thereon with the dovetail groove on load slide plate, and sliding block passes through
Pin is connect with the connector, and the elastic damping unit is fixed on the right side of sliding block.
The hydraulic pressure cylinder assembly is by ball rod, pressure sensor, hydraulic stem, hydraulic cylinder, pin two, gripper shoe groups at institute
It states ball rod to connect with elastic damping unit by pin two, the ball rod is threadedly coupled with pressure sensor, the pressure
Sensor is threadedly coupled with hydraulic stem, and hydraulic cylinder is connected to above support plate, and the support plate is fixed on bottom plate.
The connector is the bulb type expense hole on bulb simultaneously, to realize with the connection of sliding block, the sliding block its
Shape is as L-shaped, and the sliding block left side is a cylindrical boss, and expense hole is realized and connector on cylindrical boss
Connection, four threaded holes of the sliding block right side opening are for installing spring-damping element；The load slide plate is plate parts, thereon
A dovetail straight slot is opened on surface, and two triangle boss are done in upper surface left front, for limiting slider stroke, to introduce below
Impact test set by, opened on the load slide plate four threaded holes be used for connect with bottom plate；
The elastic damping unit is made of spring, contact block, sleeve, and the spring pocket is on contact block, the contact
Block, which both is sleeved in sleeve, belongs to clearance fit, is T-type structure on the left of the contact block, for installing consolidating for spring and spring
Fixed, right side is a hemispherical configuration, and the contact area for increasing ball rod and contact block, there are one sides in the sleeve left side
The boss of shape, and process four threaded holes on boss and be bolted on the right side of sliding block, the endoporus on the left of the sleeve adds
One small step of work is used for the limit of contact block, a through-hole vertically downward is processed on the cylindrical surface on the right side of the sleeve
For being connected with ball rod.
The ball rod is component of rod category, and a pin hole is opened in the ball rod front end, is connected with spring-damping element to realize
It connects, the bulb rod rear end is processed into screw thread and is connect with pressure sensor to realize.
The monitoring device is made of damping spring, ccd image sensor, oil-Absorbing Sheets, magnet, ccd image sensor peace
On damping spring, which is fixed on three-dimensional vibrating platform upper surface, and the oil-Absorbing Sheets are tiled by magnet to be fixed
On three-dimensional vibrating platform, the oil-Absorbing Sheets are discoloration oil-Absorbing Sheets.
A kind of hydraulic system component reliability test method comprising environment field, includes the following steps：
One, the loading spectrum in experimental subjects hydraulic system real work is established
(1) parameter of environmental factor is determined
1) environment temperature minimum value T of the acquisition hydraulic system in normal workminWith maximum Tmax, thus proportionally will be warm
Angle value is divided into n section, respectively [Tmin, T1]、……[Ti, Ti+1]……[Tn-1, Tmax], each temperature range is corresponding
Operating interval is t1、……ti、……tn, in order to make hydraulic system be in the state of continue working, to acquiring hydraulic system
Working time amplifies according to equal proportion, scale factor so thatHour；
Wherein TiFor the temperature value in the i-th section；
2) hydraulic system humidity minimum value h under normal operation circumstances is acquiredminAnd hmax, by air humidity also according to certain
Ratio cut partition be m subinterval, respectively [hmin, h1]、……[hj, hj+1]……[hm-1, hmax], each humidity section pair
The operating interval answered is t1、……tj、……tm, in order to make hydraulic system be in the state of continue working, to collection liquid
Pressure System production time amplifies according to equal proportion, scale factor β so thatHour；
Wherein hjFor the humidity value in jth section；
3) vibration parameters in practical work process are acquired：
Hydraulic system is under different operating modes, vibration frequency interval [fmin, fmax], according to institute's gathered data distribution situation
It is classified as L subinterval, each subinterval is [fmin, f1]、……[fk, fk+1]……[fL-1, fmax], each frequency separation
Corresponding vibration amplitude is A1、……AK、……AL, corresponding run duration t1、……tk、……tL, in order to
So that hydraulic system is in the state of continue working, acquisition hydraulic pressure System production time amplified according to equal proportion, scale factor γ,
So thatHour；
Wherein fkFor the vibration frequency value in kth section；
(2) hydraulic work system load is determined
1) oil liquid pressure of the acquisition hydraulic system under different operating modes obtains hydraulic system static pressure force value minimum value PminWith
Maximum value Pmax, a series of pressure value is recorded respectively：Pmin、P1、P2、……Pmax；And record corresponding to each pressure value N number of holds
Continuous operating time value：To ensure hydraulic system continue working so that it is determined that the acceleration in service life phase tries
Test, thus each time interval proportionally factor delta be amplified so that：Hour；
5) the type G of hydraulic oil is acquired1、……Gi、……GxTotal x kinds, regularly replace different types of during the test
Hydraulic oil is compared；
Two, according to the loading spectrum of foundation progress reliability load test, steps are as follows
(1) static loading
1) three dimensional vibration table is opened, temperature and humidity controller establishes environment field 1
The input environment temperature range value [T in temperature and humidity controllermin, T1], humidity range value [hmin, h1] and work is set
Make time t1, the inputted vibration frequency [f in three dimensional vibration table control panelmin, f1], vibration amplitude A1And duration t1；
2) experimental rig is installed
Hydraulic cylinder in hydraulic pressure cylinder assembly is substituted for hydraulic cylinder to be tested, by electro-hydraulic servo extension bar and sliding block left side
Sleeve is connected together by pin one, then by the ball rod of elastic damping unit and hydraulic stem leading portion to be tested on the right side of sliding block
It is connected by pin two, the sliding block is mounted on above load slide plate, and the two passes through in the T-shaped boss and load slide plate on sliding block
Dovetail groove cooperation, hydraulic cylinder to be tested be mounted on bottom plate top；
3) constant flow pressure-loaded experiment is carried out：
4) constant pressure flow load test：
5) parameters in environmental factor are reconfigured into determining environment field 2, environment field 3 ... is repeated in above-mentioned step
It is rapid 3) and 4), until completing static loading experiment；
(2) dynamic load
1) three dimensional vibration table is opened, temperature and humidity controller establishes environment field 1
The input environment temperature range value [T in temperature and humidity controllermin, T1], humidity range value [hmin, h1] and work is set
Make time t1, the inputted vibration frequency [f in three dimensional vibration table control panelmin, f1], vibration amplitude A1And duration t1；
2) experimental rig is installed, it is identical as static loading process；
3) constant flow pressure-loaded experiment is carried out
The hydraulic stem of electro-hydraulic servo extension bar and hydraulic cylinder to be tested is set to realize that dynamic load process is completed in the movement to support,
Premise is to maintain prepare liquid and presses flow system flow invariable, setting electrohydraulic servo device on-load pressure base value Bmin, amplitude CminNo
Become, adjusts frequencyValue, each frequency values corresponds to the load timeComplete battery of tests；
Keep attachment device constant, flow is invariable, setting electrohydraulic servo device on-load pressure amplitude Cmin, frequency
It is constant, adjustment base value BjValue, each base value corresponds to the load timeComplete second group of experiment；
The amplitude C of on-load pressure is adjusted using same methodjComplete the experiment of third group；
4) constant pressure flow load test is carried out
5) parameters in environmental factor are reconfigured and establishes environment field 2, environment field 3 ... is repeated in above-mentioned step
It is rapid 3), 4) two kinds of load tests, until completing dynamic loading test；
(3) simulated crash
1) three dimensional vibration table is opened, temperature and humidity controller establishes environment field 1
2) the input environment temperature range value [T in temperature and humidity controllermin, T1], humidity range value [hmin, h1] and be arranged
Working time t1, the inputted vibration frequency [f in three dimensional vibration table control panelmin, f1], vibration amplitude A1And duration t1；
3) experimental rig is installed
Hydraulic cylinder in hydraulic pressure cylinder assembly is substituted for hydraulic cylinder to be tested, load slide plate is fixed on to the top of bottom plate,
Sliding block is mounted on the dovetail groove on load slide plate on load bottom plate by the T-shaped boss on sliding block, sliding block is abutted against and is added
It carries on the right side of the boss on slide plate, removes pin two, ball rod is made to be detached with elastic damping unit is made, and ensure ball rod and elasticity
Damping unit is prepared to just, checking that the spoke type pressure sensor being connected on the right side of ball rod is working properly for impact test；
4) constant flow pressure-loaded experiment is carried out
Load mode one keeps same pressure value multiple impacts to test：Hydraulic cylinder to be tested is adjusted with pressure P0, adjust bullet
Spring coefficient of elasticity Kmin, damped coefficient Emin, specific collision frequency D is setmin, i.e. hydraulic stem travels forward with constant pressure and held
The continuous timeIt moves at elastic damping cell position to hydraulic stem and collides with Flexible element, setting spoke type pressure passes
The value F of sensormin, when pressure is FminWhen hydraulic cylinder internal pressure just reach Pmin, collision duration is set as △ t, i.e.,
After completing collision, hydraulic stem keeps pressure P0Backhaul carries out second and collides later, and so on complete DminSecondary impact test；
Pressure value P can be changed later1、P2……PmaxThis battery of tests is completed, while to ensure hydraulic system continue working to really
The accelerated test in regular service life, thus each time interval proportionally factor η be amplified so that：Hour；
Load mode two completes impact test under different pressures value：
Hydraulic cylinder to be tested is adjusted with pressure P00, adjustment the elastic coefficient Kmin, damped coefficient Emin, control hydraulic stem perseverance
Pressure time that travels forward isThe value that spoke type pressure sensor is arranged is Fmin, collided for the first time when with spring damping generation
Afterwards, original pressure backhaul, return interval t are kept1；The value that spoke type pressure sensor is arranged is F1So that hydraulic cylinder was colliding
Pressure just reaches P in journey1, hydraulic stem is during stretching out for second, by of short duration time t0It pressurizes so that pressure
Force value reaches P01, hydraulic stem is using the timeIt travels forward, occurring second with spring damping collides, successively class
It pushes away, adjusts pressure value P2、P3、……Pmax, corresponding experiment is completed, while to ensure hydraulic system continue working so that it is determined that the phase
The accelerated test in service life, thus each time interval proportionally factor η be amplified so that：Hour；Adjust bullet
Spring coefficient of elasticity Kmin、K1... damped coefficient Emin、E1... repeat above two load mode；
5) constant pressure flow load test is carried out, load mode is identical as step 3)；
6) parameters in environmental factor are reconfigured and establishes environment field 2, environment field 3 ... is repeated in above-mentioned step
It is rapid 3), 4) load test, until completing impact test.
The present invention by simulate actual condition to find out the weak link in hydraulic system, it is complete by electrohydraulic servo device
The pairs of dynamic force of hydraulic system, the load test of static force and impact test, at the same can also by temperature sensor,
Flow sensor, pressure sensor etc. are in real time monitored hydraulic oil, relevant parameter when to obtain breaking down, to liquid
The design of pressure system is very helpful, and the reliability for improving hydraulic system plays an important role.
Beneficial effects of the present invention：
1. the present invention uses three-dimensional vibrating platform to provide vibration condition for vibration source for experimental rig and test method, also adopt
Definite controllable humiture environment is provided for experimental rig and test method with temperature and humidity control box, to realize that hydraulic system exists
Under the conditions of different temperature, humidity, vibration etc., practical work process is simulated.
2. the present invention by pressure sensor, flow sensor, temperature sensor to the specific pressure of hydraulic oil, flow,
Temperature has carried out real-time detection, and sensor, can be on the display screen of switch board by the signal transmission measured to control system
The real time information for seeing hydraulic oil excites hydraulic system failure by adjusting humiture and Vibration Condition；Pass through tune in this way
Whole environmental parameter can find out hydraulic system component, and record temperature, flow, pressure of hydraulic oil etc. one when breaking down
Parameters in series；To improve the weak link in hydraulic system, improve the reliability of entire hydraulic system.
3. the present invention realizes static force, the application process of dynamic force to hydraulic system by force loading device, specifically apply
Adding method relies primarily on electrohydraulic servo system to complete, specifically by the extension bar of electrohydraulic servo system and ginseng by the way of to support
It is connected by sliding block with the extension bar of the hydraulic system of experiment, respectively dress carries out surveying electricity there are one spoke type force snesor for both sides
The extension bar of fluid servo system is applied to the size of hydraulic system power, and the size by controlling electrohydraulic servo system applied force is completed
A series of power load test；It is continued for loading for hydraulic system in this way, until failure generation can be obtained by hydraulic pressure in this way
System average time between failures under the conditions of determining force.
It, specifically will be on sliding block and load slide plate 4. the present invention can also simulate the case where hydraulic system extension bar collides
Boss abut, spring damping device is connected on the right side of sliding block, during hydraulic system extension bar quickly stretches out with front
Spring-damping element collision, to simulate the case where hydraulic stem collides；It can also be by replacing spring in spring damping
Stiffness simulation hydraulic system extension bar and different materials collision process, sensed by spoke type power on extension bar
The maximum, force of device acquisition collision moment；Under this experimental condition, we can be obtained by the big of impact force when a failure occurs it
Relationship that is small and breaking down, so that it is determined that the mechanism that hydraulic system breaks down in collision process.
5. the present invention carries out real-time failure monitoring using ccd image sensor, principle is that one is opened on shaking table
A rectangular channel, the one piece of oil-Absorbing Sheets in side are fixed with magnet in rectangular channel, and when the pipe fitting of hydraulic system breaks down, fluid will
It drips on oil-Absorbing Sheets, the variation of color will occur on oil-Absorbing Sheets at this time, ccd image sensor just passes through this variation identification liquid
System jam is pressed, signal is fed back into control system, control system will send out stopping signal to play failure report at once
Alert effect is immediately shut down after breaking down.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention；
Fig. 2 is Temperature and Humidity Control box assembly of the present invention shaft side projection drawing；
Fig. 3 is the structure axonometric projection graph of electrohydraulic servo device attachment device of the present invention and hydraulic pressure cylinder assembly；
Fig. 4 is the spring-damping element full sectional view of the present invention；
Fig. 5 is the three-dimensional vibrating platform of the present invention and the shaft side projection drawing of ccd image sensor；
Fig. 6 is the shaft side projection drawing that the present invention makees simulated collision test equipment therefor；
Fig. 7 is that the present invention makees to simulate the shaft side projection drawing of dynamic and static loading procedure experiment experimental rig used；
Fig. 8 is the static loading curve graph of the present invention；
Fig. 9 a are that the dynamic load of the present invention adjusts frequency curve chart；
Fig. 9 b are the dynamic load adjusting amplitude curve graphs of the present invention；
Fig. 9 c are that the dynamic load of the present invention adjusts base value curve graph；
Figure 10 a are the curve graphs of the crash loads mode one of the present invention；
Figure 10 b are the curve graphs of the crash loads mode two of the present invention；
In figure：1. three-dimensional vibrating platform, 2. braced frames, 3. monitoring devices, 301. damping springs, 302.CCD images pass
Sensor, 303. oil-Absorbing Sheets, 304. magnet, 4. electrohydraulic servo devices, 401. pedestals, 402. displacement sensors, 403. electro-hydraulic servos
Valve, 404. Flexible elements, 405. electro-hydraulic servo extension bars, 406. spoke type force snesors, 407. connectors, 408. electro-hydraulic servos
Cylinder body, 5. Temperature and Humidity Control box assemblies, 501. humiture chamber doors, 502. oil pipe holes, 503. temperature controllers, 504. humid controls
Device, 505 babinets, 6 attachment devices, 601. pins one, 602. load slide plates, 603. sliding blocks, 604. elastic damping units, 60401.
Spring, 60402. contact blocks, 60403. sleeves, 7. hydraulic pressure cylinder assemblies, 701. ball rods, 702. pressure sensors, 703. hydraulic pressure
Bar, 704. hydraulic cylinders, 705. pins two, 706 support plates, 8. bottom plates, 9. connected pipes, 10. three-position four-way electromagnetic directional valves, 11
Temperature sensor, 12 flow sensors, 13 pressure sensors, 14. fluid pressure lines one to be tested, 15 fluid pressure lines two to be tested.
Specific implementation mode
Three-dimensional vibrating platform 1 is fixed on the ground by foundation bolt, and monitoring device 3 is fixed on three-dimensional vibrating platform 1
Surface, braced frame 2 are fixed on the upper surface of three-dimensional vibrating platform 1, electrohydraulic servo device 4, attachment device 6 and hydraulic pressure cylinder assembly
7 are realized by bottom plate 8 to being just fixed in braced frame 2 later, three-position four-way electromagnetic directional valve 10, temperature sensor
11, flow sensor 12, pressure sensor 13 are mounted on the upper surface of braced frame 2, hydraulic pressure cylinder assembly 7 and 3-position 4-way electromagnetism
Reversal valve 10 is connected by connected pipes 9, and Temperature and Humidity Control box assembly 5 is mounted on the upper surface of three dimensional vibration table 1.
Fortune of the three-dimensional vibrating platform 1 by two groups of eccentric mechanisms below its workbench under motor drive
Dynamic, to realize the vibration processes of workbench, while its vibration frequency can be adjusted according to the rotating speed of motor, to meet
Vibration needed for experiment requires, since the component is outsourcing part, so concrete operating principle does not just repeat.
The braced frame 2 is plate parts, and braced frame 2 is welded by four columns and a steel plate, and four vertical
Column diameter is 50mm, and the main function of column is supporting steel plate and all devices mounted thereto；Welding one below column
The tablet of square, opens that 4 unthreaded holes are used for and three-dimensional vibrating platform 1 connects on tablet；4 equidistant rectangles are opened on the steel plate
Straight slot main purpose is to can guarantee that fluid drips on the monitoring device of underface when ensureing that hydraulic system component leaks,
To have the function that failure monitoring.
Referring to Fig.2, the Temperature and Humidity Control box assembly 5 includes humiture chamber door 501, oil pipe hole 502, temperature controller
503, humidity controller 504, babinet 505, the babinet 505 are adiabatic class part, and there are humiture chamber door 501, side in front
It opens two oil pipe holes 502 to be used for wearing fluid pressure line, the temperature controller 503 and humidity controller 504 are fixed on humiture control
On the boss at 5 rear of box assembly processed, 5 piece cover of Temperature and Humidity Control box assembly is right over three-dimensional vibrating platform 1, connection
Place uses rubber seal rings for seal, and 1 upper surface of three-dimensional vibrating platform is fixed in bolt, to realize to the whole series experiment dress
Set the control of temperature, humidity duration.
The temperature sensor 11, pressure sensor 13, by signal wire is connected to switch board at flow sensor 12 respectively
On, by the collected real time data of sensor to realize that some important parameters to hydraulic oil in entire hydraulic system carry out
Real time monitoring, when arbitrary component breaks down in hydraulic system, can be learnt corresponding when breaking down by switch board
Parameter.
Refering to Fig. 3, the electrohydraulic servo device 4 is single by pedestal 401, displacement sensor 402, electrohydraulic servo valve 403, elasticity
Member 404, electro-hydraulic servo extension bar 405, spoke type force snesor 406, connector 407 form, and the pedestal 401 is solid by screw
Determine onto bottom plate 8, the electro-hydraulic servo cylinder body (408) is fixed to by screw on pedestal 401, and institute's displacement sensors 402 are solid
Surely electro-hydraulic servo cylinder rear is arrived, the electrohydraulic servo valve 403 is mounted on above electro-hydraulic servo cylinder body, the Flexible element
404 are fixed in electro-hydraulic servo extension bar 405, and the spoke type force snesor 406 is fixed on electro-hydraulic servo extension bar 405,
407 one end of the connector is connect by screw thread with spoke type force snesor 406；
The attachment device 6 is made of pin 1, load slide plate 602, sliding block 603, elastic damping unit 604, described
Load slide plate 602 is connect by bolt with bottom plate 8, and the sliding block 603 passes through in T-shaped boss and load slide plate 602 thereon
Dovetail groove is slidably connected, and sliding block 603 is connect by pin 601 with the connector 407, and the elastic damping unit 604 is fixed
On 603 right side of sliding block；
The connector 407 is the bulb type expense hole on bulb simultaneously, described to realize the connection with sliding block 603
Its shape of sliding block 603 is as L-shaped, and 603 left side of the sliding block is a cylindrical boss, and expense hole is real on cylindrical boss
Now with the connection of connector 407, the sliding block 603 right side opening, four threaded holes are for installing spring-damping element 604；
The load slide plate 602 is plate parts, and a dovetail straight slot is opened in upper surface, and upper surface left front does two three
Angular boss is set by the impact test to be introduced below, on the load slide plate 602 for limiting slider stroke
Four threaded holes are opened to be used for connecting with bottom plate 8.
It is made of spring 60401, contact block 60402, sleeve 60403 refering to elastic damping unit 604 described in Fig. 4, it is described
Spring 60401 is sleeved on contact block 60402, and the contact block 60402 is sleeved on the two in sleeve 60403 and belongs to clearance fit, institute
It is T-type structure to state 60402 left side of contact block, and the fixation for installing spring and spring, right side is a hemispherical configuration, is used for
Increase the contact area of ball rod 701 and contact block 60402, there are one rectangular boss in the sleeve 60403 left side, and convex
Four threaded holes are processed on platform is bolted on 603 right side of sliding block, one small platform of interior hole machined on the left of the sleeve
Rank is used for the limit of contact block, and the through-hole of processing one vertically downward is used for and ball rod on the cylindrical surface on the right side of the sleeve
701 connections.
The hydraulic pressure cylinder assembly 7 is by ball rod 701, pressure sensor 702, hydraulic stem 703, hydraulic cylinder 704, pin two
705, support plate 706 forms, and the ball rod 701 is connect by pin 2 705 with elastic damping unit 604, the ball rod
701 are threadedly coupled with pressure sensor 702, and the pressure sensor 702 is threadedly coupled with hydraulic stem 703, and hydraulic cylinder 704 connects
It is connected on 706 top of support plate, the support plate 706 is fixed on bottom plate 8；
The ball rod 701 is component of rod category, and a pin hole is opened in 701 front end of the ball rod, to realization and spring damping
Unit 604 connects, and 701 rear end of the ball rod is processed into screw thread and is connect with pressure sensor 702 to realize；
Refering to Fig. 5, the monitoring device 3 is by damping spring 301, ccd image sensor 302, oil-Absorbing Sheets 303, magnet 304
Composition, ccd image sensor 302 are mounted on damping spring 301, which is fixed on 1 upper surface of three-dimensional vibrating platform,
The oil-Absorbing Sheets 303 are fixed on by the tiling of magnet 304 on three-dimensional vibrating platform 1, and the oil-Absorbing Sheets 303 are discoloration oil-Absorbing Sheets,
When there is fluid to drip on oil-Absorbing Sheets, oil-Absorbing Sheets can change colour；The first device to break down is probably determined according to fluid dripping position simultaneously
Part；There is discoloration for monitoring in the ccd image sensor 302 on oil-Absorbing Sheets, signal is fed back to switch board in real time, from
And play the role of fault alarm.
The present invention is used to complete the impact test of hydraulic system, dynamic loading test, static loading experiment, according to specific examination
Requirement is tested, the hydraulic cylinder in hydraulic pressure cylinder assembly can be replaced with hydraulic cylinder to be tested, or three-position four-way electromagnetic directional valve is replaced
Be changed to solenoid directional control valve to be tested, or by fluid pressure line 1 to be tested, fluid pressure line to be tested 2 15 respectively with 3-position 4-way
Solenoid directional control valve is connected or is connect with pressure sensor；
The fluid pressure line to be tested 1 and fluid pressure line to be tested 2 15 have several Oil-saving pipes to be connected in series respectively, main
It to be broken down by each joint of excitation, also, can be to the various models of numerical control machine tool hydraulic system by experimental rig
Connector, oil pipe are tested；
As shown in fig. 6, the collision test device is by load slide plate 602, sliding block 603, spring damping 604, ball rod
701, pressure sensor 702, hydraulic stem 703, hydraulic cylinder to be tested 704, support plate 706 form, and the sliding block 603 abuts against
On the right side of the triangle boss for loading slide plate 602, the spring-damping element 604 is fixed on sliding block by 4 hexagon socket head cap screws
603 right sides, the ball rod 701 is threadedly secured to 702 left side of pressure sensor, while ball rod 701 is hindered with spring
Buddhist nun's unit 604 maintains a certain distance, and the pressure sensor 702 is threadedly attached in 703 left side of hydraulic stem, and installation is complete
Ensure that ball rod 701 and elastic damping unit 604 are coaxial afterwards, so as to realize the impact test of hydraulic stem；
As shown in fig. 7, the load testing machine is sensed by displacement sensor 402, electrohydraulic servo valve 403, spoke type power
Device 406, connector 407, sliding block 603, pin 601, load slide plate 602, spring-damping element 604, pressure sensor 702, liquid
Compression bar 703 forms, and institute's displacement sensors 402 are bolted on electro-hydraulic servo cylinder body 408, institute's displacement sensors
402 are connected by signal wire with switch board, and for measuring hydraulic stem extension elongation, and the real-time displacement in loading procedure is adopted
Collection；The spoke type force snesor 406 is connected with connector 407, and the connector 407 is connected by pin 1 and sliding block 603
It connects；The elastic damping device 604 is bolted with sliding block 603, and the ball rod 701 is logical with elastic damping unit 604
Cross the connection of pin 2 705；The experiment dynamic and static load of hydraulic system is treated to realize, simultaneously because left side electrohydraulic servo system
The parameters such as output pressure, flow controllably provide precondition, and the innovative point of the present invention for this experiment.
A kind of hydraulic system component reliability test method comprising environment field, includes the following steps：
One, the loading spectrum in experimental subjects hydraulic system real work is established
(1) parameter of environmental factor is determined
1), environment temperature minimum value T of the acquisition hydraulic system in normal workminWith maximum Tmax, to proportionally will
Temperature value is divided into n section, respectively [Tmin, T1]、……[Ti, Ti+1]……[Tn-1, Tmax], each temperature range corresponds to
Operating interval be t1、……ti、……tn, in order to make hydraulic system be in the state of continue working, to acquiring hydraulic pressure system
The system working time amplifies according to equal proportion, scale factor so thatHour；
Wherein TiFor the temperature value in the i-th section；
2) hydraulic system humidity minimum value h under normal operation circumstances, is acquiredminAnd hmax, by air humidity also according to one
Fixed ratio cut partition is m subinterval, respectively [hmin, h1]、……[hj, hj+1]……[hm-1, hmax], each humidity section
Corresponding operating interval is t1、……tj、……tm, in order to make hydraulic system be in the state of continue working, to acquisition
The hydraulic work system time amplifies according to equal proportion, scale factor β so thatHour；
Wherein hjFor the humidity value in jth section；
3) vibration parameters in practical work process are acquired：
Hydraulic system is under different operating modes, vibration frequency interval [fmin, fmax], according to institute's gathered data distribution situation
It is classified as L subinterval, each subinterval is [fmin, f1]、……[fk, fk+1]……[fL-1, fmax], each frequency separation
Corresponding vibration amplitude is A1、……AK、……AL, corresponding run duration t1、……tk、……tL, in order to
So that hydraulic system is in the state of continue working, acquisition hydraulic pressure System production time amplified according to equal proportion, scale factor γ,
So thatHour；
Wherein fkFor the vibration frequency value in kth section；
(2) hydraulic work system load is determined
1) oil liquid pressure of the acquisition hydraulic system under different operating modes obtains hydraulic system static pressure force value minimum value PminWith
Maximum value Pmax, a series of pressure value is recorded respectively：Pmin、P1、P2、……Pmax；And record corresponding to each pressure value N number of holds
Continuous operating time value：To ensure hydraulic system continue working so that it is determined that the acceleration in service life phase tries
Test, thus each time interval proportionally factor delta be amplified so that：Hour；
5) the type G of hydraulic oil is acquired1、……Gi、……GxTotal x kinds, regularly replace different types of during the test
Hydraulic oil is compared；
Two, according to the loading spectrum of foundation progress reliability load test, steps are as follows
(1) static loading
1) three dimensional vibration table is opened, temperature and humidity controller establishes environment field 1
The input environment temperature range value [T in temperature and humidity controllermin, T1], humidity range value [hmin, h1] and work is set
Make time t1, the inputted vibration frequency [f in three dimensional vibration table control panelmin, f1], vibration amplitude A1And duration t1；
2) experimental rig is installed
Hydraulic cylinder 704 in hydraulic pressure cylinder assembly 7 is substituted for hydraulic cylinder to be tested, by electro-hydraulic servo extension bar 405 and is slided
603 left end surface sleeve of block is connected together by pin 1, then by the elastic damping unit 604 on the right side of sliding block 603 with wait trying
The ball rod for testing hydraulic stem leading portion is connected by pin 2 705, and the sliding block is mounted on 602 top of load slide plate, and the two passes through
T-shaped boss on sliding block 603 coordinate with the dovetail groove on load slide plate 602, and hydraulic cylinder to be tested is mounted on the upper of bottom plate 8
Side；
3) constant flow pressure-loaded experiment is carried out：
Keep hydraulic stem position to be tested motionless, specific loading procedure is by electrohydraulic servo device pressure value from 0 → PminContinue
Time isWhen pressure value reaches PminThe later protracted test timePressure value is from P latermin→P1Time used isWhen pressure value reaches P1The later durationAnd so on successively by pressure value P2、P3、……PmaxIt is loaded into and waits for
It tests in hydraulic system；Duration is respectivelyAnd meetIt is small
When, specific loading curve is refering to Fig. 8；
4) constant pressure flow load test：
5) parameters in environmental factor are reconfigured into determining environment field 2, environment field 3 ... is repeated in above-mentioned step
It is rapid 3) and 4), until completing static loading experiment；
(2) dynamic load
1) three dimensional vibration table is opened, temperature and humidity controller establishes environment field 1
The input environment temperature range value [T in temperature and humidity controllermin, T1], humidity range value [hmin, h1] and work is set
Make time t1, the inputted vibration frequency [f in three dimensional vibration table control panelmin, f1], vibration amplitude A1And duration t1；
2) experimental rig is installed, it is identical as static loading process；
3) constant flow pressure-loaded experiment is carried out
The hydraulic stem of electro-hydraulic servo extension bar and hydraulic cylinder to be tested is set to realize that dynamic load process is completed in the movement to support,
Premise is to maintain prepare liquid and presses flow system flow invariable, setting electrohydraulic servo device on-load pressure base value Bmin, amplitude CminNo
Become, adjusts frequencyValue, each frequency values corresponds to the load timeComplete battery of tests；
Keep attachment device constant, flow is invariable, setting electrohydraulic servo device on-load pressure amplitude Cmin, frequency
It is constant, adjustment base value BjValue, each base value corresponds to the load timeComplete second group of experiment；
The amplitude C of on-load pressure is adjusted using same methodjComplete the experiment of third group；
4) constant pressure flow load test is carried out
5) parameters in environmental factor are reconfigured and establishes environment field 2, environment field 3 ... is repeated in above-mentioned step
It is rapid 3), 4) two kinds of load tests, until completing dynamic loading test；
(3) simulated crash
1) three dimensional vibration table is opened, temperature and humidity controller establishes environment field 1
2) the input environment temperature range value [T in temperature and humidity controllermin, T1], humidity range value [hmin, h1] and be arranged
Working time t1, the inputted vibration frequency [f in three dimensional vibration table control panelmin, f1], vibration amplitude A1And duration t1；
3) experimental rig is installed
Hydraulic cylinder 704 in hydraulic pressure cylinder assembly 7 is substituted for hydraulic cylinder to be tested, load slide plate 602 is fixed on bottom plate 8
Top, sliding block 603 is mounted on load bottom plate by T-shaped boss on sliding block 603 and the dovetail groove on load slide plate 602
On 602, sliding block is abutted against on the right side of the boss on load slide plate 602, remove pin 2 705, made ball rod 701 and make elastic resistance
Buddhist nun's unit 604 detaches, and ensures that ball rod 701 is connected to 701 right side of ball rod with elastic damping unit 604 to just, checking
Spoke type pressure sensor is working properly, prepares for impact test；
4) constant flow pressure-loaded experiment is carried out
Load mode one keeps same pressure value multiple impacts to test：Hydraulic cylinder to be tested is adjusted with pressure P0, adjust bullet
Spring coefficient of elasticity Kmin, damped coefficient Emin, specific collision frequency D is setmin, i.e. hydraulic stem travels forward with constant pressure and held
The continuous timeIt moves at elastic damping cell position to hydraulic stem and collides with Flexible element, setting spoke type pressure passes
The value F of sensormin, when pressure is FminWhen hydraulic cylinder internal pressure just reach Pmin, collision duration is set as △ t, i.e.,
After completing collision, hydraulic stem keeps pressure P0Backhaul carries out second and collides later, and so on complete DminSecondary impact test；
Pressure value P can be changed later1、P2……PmaxThis battery of tests is completed, while to ensure hydraulic system continue working to really
The accelerated test in regular service life, thus each time interval proportionally factor η be amplified so that：Hour；
Load mode two completes impact test under different pressures value：
Hydraulic cylinder to be tested is adjusted with pressure P00, adjustment the elastic coefficient Kmin, damped coefficient Emin, control hydraulic stem perseverance
Pressure time that travels forward isThe value that spoke type pressure sensor is arranged is Fmin, collided for the first time when with spring damping generation
Afterwards, original pressure backhaul, return interval t are kept1；The value that spoke type pressure sensor is arranged is F1So that hydraulic cylinder was colliding
Pressure just reaches P in journey1, hydraulic stem is during stretching out for second, by of short duration time t0It pressurizes so that pressure
Force value reaches P01, hydraulic stem is using the timeIt travels forward, occurring second with spring damping collides, successively class
It pushes away, adjusts pressure value P2、P3、……Pmax, corresponding experiment is completed, while to ensure hydraulic system continue working so that it is determined that the phase
The accelerated test in service life, thus each time interval proportionally factor η be amplified so that：Hour；Adjust bullet
Spring coefficient of elasticity Kmin、K1... damped coefficient Emin、E1... repeat above two load mode；
5) constant pressure flow load test is carried out, load mode is identical as step (3)；
6) parameters in environmental factor are reconfigured and establishes environment field 2, environment field 3 ... is repeated in above-mentioned step
It is rapid 3), 4) load test, until completing impact test.
Failure monitoring
Hydraulic system vulnerable part is excited to break down by static loading experiment, dynamic loading test, impact test, such as
Say most common failure：Hydraulic tube rises brokenly, the loosening of joint sealing device, the abrasion of hydraulic cylinder sealing circle failure, casing wall, valve core of the electromagnetic valve
Fracture etc.；These failures can be monitored in real time by the ccd image sensor on three-dimensional vibrating platform, work as oil suction
When having oil mark to occur on paper, this signal is just passed to switch board by ccd image sensor, and switch board stops hydraulic pressure at the first time
System works, and finds the hydraulic component corresponding to oil mark top, determines its specific failure；It simultaneously can also be according to flow sensing
A threshold value is arranged to them respectively in device, pressure sensor, temperature sensor, and when hydraulic oil reaches a certain threshold value, system will
Reason is found out in alarm, shutdown.
The interpretation of result of reliability test
Exciting hydraulic system vulnerable part by experiment, (hydraulic tube rises brokenly, joint sealing device, hydraulic cylinder sealing circle are former
Barrier, casing wall abrasion, valve core of the electromagnetic valve fracture etc.) it breaks down, it obtains as drawn a conclusion：
(1) the mean time between failures working time MTBF values of subject hydraulic system are determined；
(2) failure is analyzed, finds out the weak link in hydraulic system, rectification meaning is provided for the design of hydraulic system
See, improves its reliability level；
(3) the Proper use of technology specification for determining hydraulic system, the superpressure work that prevents from overloading for a long time is to hydraulic system
It destroys, provides a correct hydraulic system operation instructions to the user；
(4) a monitor and alarm system is provided for hydraulic system, closes hydraulic system at the first time when breaking down, prevented
Only a large amount of leakages of fluid；
(5) prior-warning device is provided for the hydraulic system under some specific environments, when the pressure of hydraulic oil, flow, temperature are low
In a certain threshold value or more than a certain threshold value when, hydraulic system is automatically stopped work, to hydraulic system carry out fault diagnosis.
The present invention mainly by simulating actual condition to find out the weak link in hydraulic system, is filled by electro-hydraulic servo
Completion is set to the dynamic force of hydraulic system, the load test of static force and impact test, while temperature sensing can also be passed through
Device, flow sensor, pressure sensor etc. are in real time monitored hydraulic oil, relevant parameter when to obtain breaking down,
It is very helpful to the design of hydraulic system, the reliability for improving hydraulic system plays an important role.
Claims (9)
1. a kind of hydraulic system component reliability experimental rig comprising environment field, it is characterised in that：Three-dimensional vibrating platform is logical
It crosses foundation bolt to fix on the ground, monitoring device is fixed on three-dimensional vibrating platform upper surface, and braced frame is fixed on three-dimensional and shakes
The upper surface of moving platform, electrohydraulic servo device, attachment device and hydraulic pressure cylinder assembly are realized by bottom plate to being just fixed later
On the support frame, three-position four-way electromagnetic directional valve, temperature sensor, flow sensor, pressure sensor are mounted on support frame
The upper surface of frame, hydraulic pressure cylinder assembly and three-position four-way electromagnetic directional valve are connected by connected pipes, Temperature and Humidity Control box assembly peace
Mounted in the upper surface of three dimensional vibration table；
The electrohydraulic servo device is by pedestal, displacement sensor, electrohydraulic servo valve, Flexible element, electro-hydraulic servo extension bar, spoke
Formula force snesor, connector composition, the pedestal are fixed to by screw on bottom plate, and the electro-hydraulic servo cylinder body is solid by screw
Determine onto pedestal, institute's displacement sensors are fixed to electro-hydraulic servo cylinder rear, and the electrohydraulic servo valve is mounted on electro-hydraulic watch
It takes above cylinder body, the Flexible element is fixed in electro-hydraulic servo extension bar, and the spoke type force snesor is fixed on electro-hydraulic watch
It takes on extension bar, described connector one end is connect by screw thread with spoke type force snesor.
2. a kind of hydraulic system component reliability experimental rig comprising environment field according to claim 1, feature
It is：The braced frame is plate parts, and braced frame is welded by four columns and a steel plate, is opened on the steel plate
4 equidistant rectangular straight slot.
3. a kind of hydraulic system component reliability experimental rig comprising environment field according to claim 1, feature
It is：The Temperature and Humidity Control box assembly includes humiture chamber door, oil pipe hole, temperature controller, humidity controller, babinet, institute
It is adiabatic class part to state babinet, and front has humiture chamber door, side to open two oil pipe holes and be used for wearing fluid pressure line, the temperature
Controller and humidity controller are fixed on the boss at Temperature and Humidity Control box assembly rear.
4. a kind of hydraulic system component reliability experimental rig comprising environment field according to claim 1, feature
It is：The attachment device is made of pin one, load slide plate, sliding block, elastic damping unit, and the load slide plate passes through bolt
It is connect with bottom plate, the sliding block is slidably connected by T-shaped boss thereon with the dovetail groove on load slide plate, and sliding block passes through pin
It is connect with the connector, the elastic damping unit is fixed on the right side of sliding block.
5. a kind of hydraulic system component reliability experimental rig comprising environment field according to claim 1, feature
It is：The hydraulic pressure cylinder assembly is by ball rod, pressure sensor, hydraulic stem, hydraulic cylinder, pin two, gripper shoe groups at the ball
Head rod is connect by pin two with elastic damping unit, and the ball rod is threadedly coupled with pressure sensor, the pressure sensing
Device is threadedly coupled with hydraulic stem, and hydraulic cylinder is connected to above support plate, and the support plate is fixed on bottom plate.
6. a kind of hydraulic system component reliability experimental rig comprising environment field according to claim 4, feature
It is：Its shape of the sliding block is a cylindrical boss as L-shaped, on the left of the sliding block, and the expense on cylindrical boss
The connection with connector is realized in hole, and four threaded holes of the sliding block right side opening are for installing spring-damping element；The load is slided
Plate is plate parts, and a dovetail straight slot is opened in upper surface, and two triangle boss are done in upper surface left front, for limiting sliding block
Stroke opens four threaded holes on the load slide plate and is used for connecting with bottom plate；
The elastic damping unit is made of spring, contact block, sleeve, and the spring pocket is on contact block, the contact block set
Belong to clearance fit both in sleeve, be T-type structure on the left of the contact block, the fixation for installing spring and spring is right
Side is a hemispherical configuration, and the contact area for increasing ball rod and contact block, there are one rectangular in the sleeve left side
Boss, and process four threaded holes on boss and be bolted on the right side of sliding block, the interior hole machined one on the left of the sleeve
A small step is used for the limit of contact block, and the through-hole of processing one vertically downward is used on the cylindrical surface on the right side of the sleeve
It is connected with ball rod.
7. a kind of hydraulic system component reliability experimental rig comprising environment field according to claim 5, feature
It is：The ball rod is component of rod category, and a pin hole is opened in the ball rod front end, is connect with spring-damping element to realize,
The bulb rod rear end is processed into screw thread and is connect with pressure sensor to realize.
8. a kind of hydraulic system component reliability experimental rig comprising environment field according to claim 1, feature
It is：The monitoring device is made of damping spring, ccd image sensor, oil-Absorbing Sheets, magnet, and ccd image sensor is mounted on
On damping spring, which is fixed on three-dimensional vibrating platform upper surface, and the oil-Absorbing Sheets are fixed on three by magnet tiling
It ties up on shaking platform, the oil-Absorbing Sheets are discoloration oil-Absorbing Sheets.
9. a kind of hydraulic system component reliability test method comprising environment field, it is characterised in that include the following steps：
One, the loading spectrum in experimental subjects hydraulic system real work is established
(1) parameter of environmental factor is determined
1) environment temperature minimum value T of the acquisition hydraulic system in normal workminWith maximum Tmax, to proportionally by temperature value
It is divided into n section, respectively [Tmin, T1]、……[Ti, Ti+1]……[Tn-1, Tmax], the corresponding work of each temperature range
Time interval is t1、……ti、……tn, in order to make hydraulic system be in the state of continue working, to acquiring hydraulic work system
Time amplifies according to equal proportion, scale factor so thatHour；
Wherein TiFor the temperature value in the i-th section；
2) hydraulic system humidity minimum value h under normal operation circumstances is acquiredminAnd hmax, by air humidity also according to certain ratio
Example is divided into m subinterval, respectively [hmin, h1]、……[hj, hj+1]……[hm-1, hmax], each humidity section is corresponding
Operating interval is t1、……tj、……tm, in order to make hydraulic system be in the state of continue working, to acquiring hydraulic pressure system
The system working time amplifies according to equal proportion, scale factor β so thatHour；
Wherein hjFor the humidity value in jth section；
3) vibration parameters in practical work process are acquired：
Hydraulic system is under different operating modes, vibration frequency interval [fmin, fmax], according to institute's gathered data distribution situation by its
It is divided into L subinterval, each subinterval is [fmin, f1]、……[fk, fk+1]……[fL-1, fmax], each frequency separation is opposite
The vibration amplitude answered is A1、……AK、……AL, corresponding run duration t1、……tk、……tL, in order to make liquid
Pressure system is in the state of continue working, amplifies according to equal proportion to acquisition hydraulic pressure System production time, scale factor γ so thatHour；
Wherein fkFor the vibration frequency value in kth section；
(2) hydraulic work system load is determined
1) oil liquid pressure of the acquisition hydraulic system under different operating modes obtains hydraulic system static pressure force value minimum value PminAnd maximum
Value Pmax, a series of pressure value is recorded respectively：Pmin、P1、P2、……Pmax；And record N number of lasting work corresponding to each pressure value
Make time value：To ensure hydraulic system continue working so that it is determined that the accelerated test in service life phase, institute
With each time interval proportionally factor delta be amplified so that：Hour；
2) oil liquid pressure of the acquisition hydraulic system under different operating modes obtains hydraulic system dynamic pressure value base value：Bmin、B1、
B2、……Bmax, amplitude：Cmin、C1、C2、……Cmax, frequency：Remember under conditions of various work
Record M continuous working period value：It is similarly and ensures hydraulic system continue working so that it is determined that longevity phase
The accelerated test of life, thus each time interval proportionally factor ε be amplified so that：Hour；
3) coefficient of elasticity and damped coefficient for acquiring oil liquid pressure value of hydraulic system during colliding and being hit material,
Obtain hydraulic system instantaneous pressure value：Hit the coefficient of elasticity K of materialmin、K1、K2、……
Kmax, damped coefficient Emin、E1、E2、……EmaxAnd the collision frequency D under a pressure conditionmin、D1、D2、……DmaxWith O
Continuous working period valueIt is similarly and ensures hydraulic system continue working so that it is determined that the acceleration in service life phase
Experiment, thus each time interval proportionally factor η be amplified so that：Hour；
4) fluid flow of the acquisition hydraulic system under different operating modes, obtains corresponding flow value：Qmin、Q1、Q2、……Qmax,
Z continuous working period value is recorded under each flow conditionIt is similarly and ensures hydraulic system continue working
So that it is determined that the accelerated test in service life phase, thus each time interval proportionally factor θ be amplified so that：It is small
When；
5) the type G of hydraulic oil is acquired1、……Gi、……GxTotal x kinds, regularly replace different types of hydraulic pressure during the test
Oil is compared；
Two, according to the loading spectrum of foundation progress reliability load test, steps are as follows
(1) static loading
1) three dimensional vibration table is opened, temperature and humidity controller establishes environment field 1
The input environment temperature range value [T in temperature and humidity controllermin, T1], humidity range value [hmin, h1] and when work is set
Between t1, the inputted vibration frequency [f in three dimensional vibration table control panelmin, f1], vibration amplitude A1And duration t1；
2) experimental rig is installed
Hydraulic cylinder in hydraulic pressure cylinder assembly is substituted for hydraulic cylinder to be tested, by electro-hydraulic servo extension bar and sliding block left end surface sleeve
Connected together by pin one, then by the right side of sliding block elastic damping unit and the ball rod of hydraulic stem leading portion to be tested pass through
Pin two connects, and the sliding block is mounted on above load slide plate, and the two passes through the T-shaped boss on sliding block and the swallow on load slide plate
Stern notch coordinates, and hydraulic cylinder to be tested is mounted on the top of bottom plate；
3) constant flow pressure-loaded experiment is carried out：
Keep hydraulic stem position to be tested motionless, specific loading procedure is by electrohydraulic servo device pressure value from 0 → PminDuration
ForWhen pressure value reaches PminThe later protracted test timePressure value is from P latermin→P1Time used is
When pressure value reaches P1The later durationAnd so on successively by pressure value P2、P3、……PmaxIt is loaded into liquid to be tested
In pressure system；Duration is respectively And meetHour；
4) constant pressure flow load test：
It keeps hydraulic cylinder works pressure to be tested constant and pressure value is PminSo that electrohydraulic servo device can drag to be tested
Hydraulic cylinder extension bar does stretching motion, and the speed for adjusting electro-hydraulic servo extension bar is that hydraulic cylinder flow to be tested is controlled, from
And make flow value from 0 → QminTransformation period is △ t1', when flow reaches QminIt is in the state that hydraulic stem remains a constant speed later
It persistently stretches, the duration is θ * t1'；Flow value is from Q latermin→Q1Time used is △ t'2, when flow value reaches Q1After
Duration θ * t'2；And so on successively by flow value Q3、Q4、……QmaxIt is loaded into hydraulic system to be tested；When lasting
Between be respectively θ * t '3、θ*t′4……θ*t'j……θ*t′Z, and meetHour；
5) parameters in environmental factor are reconfigured into determining environment field 2, environment field 3 ... is repeated in above-mentioned steps 3)
With 4), tested until completing static loading；
(2) dynamic load
1) three dimensional vibration table is opened, temperature and humidity controller establishes environment field 1
The input environment temperature range value [T in temperature and humidity controllermin, T1], humidity range value [hmin, h1] and when work is set
Between t1, the inputted vibration frequency [f in three dimensional vibration table control panelmin, f1], vibration amplitude A1And duration t1；
2) experimental rig is installed, it is identical as static loading process；
3) constant flow pressure-loaded experiment is carried out
The hydraulic stem of electro-hydraulic servo extension bar and hydraulic cylinder to be tested is set to realize that dynamic load process, premise are completed in the movement to support
It is invariable to be to maintain flow rate of hydraulic system to be measured, setting electrohydraulic servo device on-load pressure base value Bmin, amplitude CminIt is constant, it adjusts
Whole frequency fi *Value, each frequency values corresponds to the load timeComplete battery of tests；
Keep attachment device constant, flow is invariable, setting electrohydraulic servo device on-load pressure amplitude Cmin, frequencyNo
Become, adjustment base value BjValue, each base value corresponds to the load timeComplete second group of experiment；
The amplitude C of on-load pressure is adjusted using same methodjComplete the experiment of third group；
4) constant pressure flow load test is carried out
The hydraulic stem of electro-hydraulic servo extension bar and hydraulic cylinder to be tested is allowed to realize that dynamic load process, premise are completed in the movement to support
It is invariable to be to maintain hydraulic system pressure to be measured, is respectively completed flow Qmin、Q1、Q2……QmaxLoading procedure, in each stream
Continuous working period is under the conditions of amountBe similarly ensure hydraulic system continue working to
Determine the accelerated test in service life phase, thus each time interval proportionally factor θ be amplified so that：Hour；
5) parameters in environmental factor are reconfigured and establishes environment field 2, environment field 3 ... is repeated in above-mentioned steps
3), 4) two kind load test, until completing dynamic loading test；
(3) simulated crash
1) three dimensional vibration table is opened, temperature and humidity controller establishes environment field 1
2) the input environment temperature range value [T in temperature and humidity controllermin, T1], humidity range value [hmin, h1] and work is set
Time t1, the inputted vibration frequency [f in three dimensional vibration table control panelmin, f1], vibration amplitude A1And duration t1；
3) experimental rig is installed
Hydraulic cylinder in hydraulic pressure cylinder assembly is substituted for hydraulic cylinder to be tested, load slide plate is fixed on to the top of bottom plate, will be slided
Block is mounted on the dovetail groove on load slide plate on load bottom plate by the T-shaped boss on sliding block, and sliding block, which is abutted against load, to be slided
On the right side of boss on plate, remove pin two, ball rod is made to be detached with elastic damping unit is made, and ensures ball rod and elastic damping
Unit is prepared to just, checking that the spoke type pressure sensor being connected on the right side of ball rod is working properly for impact test；
4) constant flow pressure-loaded experiment is carried out
Load mode one keeps same pressure value multiple impacts to test：Hydraulic cylinder to be tested is adjusted with pressure P0, adjust spring bullet
Property coefficient Kmin, damped coefficient Emin, specific collision frequency D is setmin, i.e., when hydraulic stem travels forward lasting with constant pressure
BetweenIt moves at elastic damping cell position to hydraulic stem and collides with Flexible element, setting spoke type pressure sensor
Value Fmin, when pressure is FminWhen hydraulic cylinder internal pressure just reach Pmin, collision duration is set as △ t, that is, completes to touch
After hitting, hydraulic stem keeps pressure P0Backhaul carries out second and collides later, and so on complete DminSecondary impact test；Later may be used
To change pressure value P1、P2……PmaxThis battery of tests is completed, while to ensure hydraulic system continue working so that it is determined that longevity phase
The accelerated test of life, thus each time interval proportionally factor η be amplified so that：Hour；
Load mode two completes impact test under different pressures value：
Hydraulic cylinder to be tested is adjusted with pressure P00, adjustment the elastic coefficient Kmin, damped coefficient Emin, control hydraulic stem constant pressure
Time that travels forward isThe value that spoke type pressure sensor is arranged is Fmin, after occurring to collide for the first time with spring damping,
Keep original pressure backhaul, return interval t1；The value that spoke type pressure sensor is arranged is F1So that hydraulic cylinder is in collision process
Middle pressure just reaches P1, hydraulic stem is during stretching out for second, by of short duration time t0It pressurizes so that pressure
Value reaches P01, hydraulic stem is using the timeIt travels forward, occurring second with spring damping collides, and so on,
Adjust pressure value P2、P3、……Pmax, corresponding experiment is completed, while to ensure hydraulic system continue working so that it is determined that longevity phase
The accelerated test of life, thus each time interval proportionally factor η be amplified so that：Hour；Adjust spring
Coefficient of elasticity Kmin、K1... damped coefficient Emin、E1... repeat above two load mode；
5) constant pressure flow load test is carried out, load mode is identical as step 3)；
6) parameters in environmental factor are reconfigured and establishes environment field 2, environment field 3 ... is repeated in above-mentioned steps
3), 4) load test, until completing impact test.
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| CN106338969B (en) * | 2016-10-21 | 2018-09-14 | 吉林大学 | Electro-hydraulic servo feed system reliability test and test method |
| CN106644266A (en) * | 2016-12-23 | 2017-05-10 | 中国南方航空工业(集团)有限公司 | Pressure sensor detection equipment |
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